. Author manuscript; available in PMC: 2011 Dec 1.

Published in final edited form as: J Biomater Sci Polym Ed. 2011 Mar;22(10):1275–1298. doi: 10.1163/092050610X504260

Table 1.

Characteristics of ECT copolymers synthesized by ring opening copolymerization of ε-CL and TSU using mPEG (Mn=2,000 g/mol) as the initiator, and Sn(Oct)₂ (0.1mol% of the hydroxyl group in mPEG) as the catalyst. The polymerization was carried out in bulk at 110 °C for 24 h.

ID	Feed ratio (g)			Yield (%)	Polymer composition^a	M_n^b (kg/mol)	M_w^b (kg/mol)	PDI^b
ID	PEG	CL	TSU	Yield (%)	Polymer composition^a	M_n^b (kg/mol)	M_w^b (kg/mol)	PDI^b
ECT0	1.0	10.0	0.0	87.3	EG₁₁₃CL₄₂₇	56.7	78.3	1.38
ECT2	1.0	8.0	2.0	85.2	EG₁₁₃CL₃₂₈TSU₅₅	44.9	54.8	1.22
ECT5	1.0	5.0	5.0	78.2	EG₁₁₃CL₂₀₈TSU₁₃₃	44.7	59.1	1.32
ECT10	1.0	0	10.0	57.4	EG₁₁₃TSU₂₆₁	44.0	58.9	1.34

Composition of CL and TSU calculated by ¹H NMR.

M_n, M_w, and PDI (polydispersity index) determined by GPC.